How to read codes inside headers?

Question

Hello, I'm looking for an article or writings that tells about variables with two underscores and such other things. For example when ctrl+left click on printf function, it brings stdio.h and I want to read them up to some point. Do you know any thing about it? Secondly, is it idle to read them?

https://code.sololearn.com/cZm9hk3W2iDf

Answer 1

https://stackoverflow.com/questions/224397/why-do-people-use-double-underscore-so-much-in-c I had the same question a while ago :) and this helped me alot

Answer 2

Sorry I dont understand your main question or maybe Ive interpreted false. So as I unterstand you want to read headers? So if you imported any libraries (like stdio. h) you can go to the docs. But I think you want a IDE which is gonna display the declaration of a variable if you use it right? So basically my all time favorite IDE for cpp is Visual Studio Code. You can download the main c++ extension and then you will have what you want. Feel free to ask if i missunterstood you. :)

Answer 3

At least underscore in variable _Result means what for example? Likewise when double underscore comes what happens?